Portable punching exercise device



FIG. 1 is a front and top perspective view of a portable punching exercise device embodying my new design;

FIG. 2 is a right side elevational view thereof; the left side elevational view being a mirror image;

FIG. 3 is a front elevational view thereof, the rear elevational view being a mirror image;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a front elevational view thereof in a folded configuration. 

The ornamental design for a portable punching exercise device, as shown. 